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The impact of Sirex noctilio in Pinus resinosa and Pinus sylvestris stands in New York and Ontario

2010; NRC Research Press; Volume: 40; Issue: 2 Linguagem: Inglês

10.1139/x09-181

1208-6037

Kevin J. Dodds, Peter de Groot, David A. Orwig,

Insect-Plant Interactions and Control

Sirex noctilio Fabricius has a long history as an invasive insect species in pine plantations throughout the Southern Hemisphere and has been recently discovered in North America, where it is uncertain how this insect will behave in pine ecosystems. To assess the impact and attack behavior of S. noctilio, forest surveys and measurements from attacked and unattacked trees were taken in nine Pinus resinosa Ait. and Pinus sylvestris L. plantations in New York, USA, and Ontario, Canada. There was a trend of S. noctilio attacking suppressed trees with smaller live crowns and reduced growth. Some S. noctilio attacks were also found in dominant crown classes but at a lower rate than overtopped or intermediate classes. Sirex noctilio appeared to have more of an impact in P. sylvestris forests, as they attacked more stems (9%–18%) and higher basal area (1.6–5.5 m 2 /ha) than P. resinosa stands (3%–8% of stems and 0.4–2.4 m 2 /ha). Dead trees with signs of Siricidae and dead from other causes were also quantified, and in some P. resinosa stands, levels were greater in magnitude than S. noctilio losses. Data from this study suggest that silvicultural treatments should be a key component of integrated pest management plans for S. noctilio.